Jeans are ok i wouldn't go with a t-shirt. A polo would be fine.
No t-shirt... Collar needed. If jeans, must be nice...
No T-shirts, neat jeans with dressy shoes and a button down shirt would be perfectly fine
You can wear jeans and a dress shirt
I would recommend slacks and collar shirt
Slacks and a collared shirt for men. Dress pants or a dress for women.
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